As not being hard-to-the-core i may have missed it, but also in
1951, in March, the wonderful Grace Hopper "conceives the first
compiler, called A-O and later released as Math-Matic. Hopper is
also credited with coining the term 'bug' following an incident
involving a moth and a Mark II.
Yes, but wrongly. The label next to the moth is "First actual case of bug being found", and the word "actual" shows that the slang term already existed then. Brief unexplained faults on telephony (and before that telegraphy) lines were "bugs on the line" back in the 19C. Vibroplex telegraph keys, first sold in 1905, had a picture of a beetle on the top of the key, and were notorious for creating bugs when inexperienced operators used them. (Vibroplex is still in business, still selling its continuous-operation telegraph keys, which ditt as long as you hold the paddle to the right.)